塑料球閥按結構形式分類

 

　　球閥的球體是浮動的，在介質壓力作用下，球體能產生一定的位移並緊壓在出口端的密封麵上，保證出口端密封。 

 

　　浮fu動dong球qiu球qiu閥fa的de結jie構gou簡jian單dan，密mi封feng性xing好hao
，但dan球qiu體ti承cheng受shou工gong作zuo介jie質zhi的de載zai荷he全quan部bu傳chuan給gei了le出chu口kou密mi封feng圈quan，因yin此ci要yao考kao慮lv密mi封feng圈quan材cai料liao能neng否fou經jing受shou得de住zhu球qiu體ti介jie質zhi的de工gong作zuo載zai荷he。這zhe種zhong結jie構gou，廣guang泛fan用yong於yu中zhong低di壓ya球qiu閥fa。 

 

　　二
、固定球塑料球閥 

 

　　球qiu閥fa的de球qiu體ti是shi固gu定ding的de
，受shou壓ya後hou不bu產chan生sheng移yi動dong。固gu定ding球qiu球qiu閥fa都dou帶dai有you浮fu動dong閥fa座zuo


，受shou介jie質zhi壓ya力li後hou，閥fa座zuo產chan生sheng移yi動dong，使shi密mi封feng圈quan緊jin壓ya在zai球qiu體ti上shang，以yi保bao證zheng密mi封feng。通tong常chang在zai與yu球qiu體ti的de上shang、下軸上裝有軸承
，操作扭距小，適用於高壓和大口徑的閥門。 

 

　　weilejianshaoqiufadecaozuoniujuhezengjiamifengdekekaochengdu，jinnianlaiyouchuxianleyoufengqiufa
，jizaimifengmianjianyazhutezhiderunhuayou，yixingchengyicengyoumo，jizengqianglemifengxing，youjianshaolecaozuoniuju，gengshiyonggaoyadakoujingdeqiufa。 

 

　　三、彈性球塑料球閥 

 

　　qiufadeqiutishidanxingde。qiutihefazuomifengquandoucaiyongjinshucailiaozhizao，mifengbiyahenda，yikaojiezhibenshendeyaliyidabudaomifengdeyaoqiu，bixushijiawaili。zhezhongfamenshiyongyugaowengaoyajiezhi。 

 

　　彈(dan)性(xing)球(qiu)體(ti)是(shi)在(zai)球(qiu)體(ti)內(nei)壁(bi)的(de)下(xia)端(duan)開(kai)一(yi)條(tiao)彈(dan)性(xing)槽(cao)
，而(er)獲(huo)得(de)彈(dan)性(xing)。當(dang)關(guan)閉(bi)通(tong)道(dao)時(shi)
，用(yong)閥(fa)杆(gan)的(de)楔(xie)形(xing)頭(tou)使(shi)球(qiu)體(ti)漲(zhang)開(kai)與(yu)閥(fa)座(zuo)壓(ya)緊(jin)達(da)到(dao)密(mi)封(feng)。在(zai)轉(zhuan)動(dong)球(qiu)體(ti)之(zhi)前(qian)先(xian)鬆(song)開(kai)楔(xie)形(xing)頭(tou)，球(qiu)體(ti)隨(sui)之(zhi)恢(hui)複(fu)原(yuan)原(yuan)形(xing)
，使(shi)球(qiu)體(ti)與(yu)閥(fa)座(zuo)之(zhi)間(jian)出(chu)現(xian)很(hen)小(xiao)的(de)間(jian)隙(xi)

，可(ke)以(yi)減(jian)少(shao)密(mi)封(feng)麵(mian)的(de)摩(mo)擦(ca)和(he)操(cao)作(zuo)扭(niu)矩(ju)。 

 

　　球閥按其通道位置可分為直通式
，三通式和直角式。三通式和直角式球閥用於分配介質與改變介質的流向。